Window lock



uh J m Jan. 22,

D. w. MCKINNISI wmnow LOCK Filed Da e. 4. 1922 Patented Jan. 22, 1924.

UNITED "STATES PATENT OFFICE;

DAVID W. MCKINNIS, OF DES MOINES,IOWA, ASSIGNOR OF ONE-HALF T0 HOWARD W.

. GOULD, OF DES MOINES, IOWA.

' V WINDOW LOCK.

Applicationfiled December 4, 1922. Serial No. 604,783.

To all whom it may concern:

Be it known that I, DAVID WQMCKINNIS, a citizen of the United States,and a resident of Des Moines, in the county of Polk and State of Iowa,have invented a certain new and useful Window Lock, ofwhich thefollowing is a specification. V The object of my invention is to providea window lock of simple, durable, and comparatively inexpensiveconstruction. 7

More particularly, my invention relates to a lock which is also utilizedfor holding the window in any of its positions.

More particularly, my invention relates to a spring actuated plungermember for engaging the window sash, thereby looking it' againstundesired movement.

Still a further object is to provide a control member for the plungerwhereby the plunger may be moved and held in inoperative position.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claim, and illustrated in theaccompanying drawings, in which:

Figure 1 is a perspective view of a window frame and sash with myimproved lock shown thereon.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Figure 3 is a sectional view taken on line 33 of Figure 2; and V Figure4 is a detail, sectional, perspective, view of my control device.

In the accompanying drawings, I have used the reference numeral toindicate generally a Window frame which is provided with a lower sash 11and upper sash 12. The upper and lower sashes 11 and 12 are mounted forsliding movement, between the guide strips 13.

In each of the sides of the sashes 11 and 12, I form a groove 14, whichextends from the top to the bottom of the sash. Within the groove 14 ismounted a notched plate 15. The plate 15 is formed with teeth which haveone side inclined. The plate 15 may be secured tothe sash by means ofscrews or the like 16.

Mounted on the sides of the frame 10 are the spring plates 17 The springplates 17 are secured by means of the screws 18. In

the'upper ends of the the pins 19.

A reinforcing hub 20 is mounted on the upper ends of the plates 17 andhas the pins 19 extended therein. The pins 19 project through theopenings 21 formed in the side of the frame 10. The pins 19 are designedto engage the notches in the plates 15.

In order to move the pin 19 to the position shown in dotted linesinFigure 3 of the drawings, provide control bars 26, which projectthrough the casing or frame 10. The control bars 26 are provided withheads 28 which may be engaged for manipulating the bars 26; On eachofthe control bars 26 I mount a cam face 29 which is designed to engagethe spring plate 17 for springing it away from the sash. A hearing 30 isprovided for the inner end of the control bar When the bar 26 is innormal position it will merely touch the spring plate 17 and when inthis position will permit the pin 19 to engage one of the notches in theplate or bar 15.

When the bar 26 is slid to cause the cam face 29 to engage the plate 17and spring it to the position shown in dottedlines in Figure 3, thisaction will cause the pin 19 to disengage the bar or plate 15, therebypermitting movement of the window sashes.

The plate 15 is so arranged that when the lower sash 11 is in its closedor down position, the pin 19 will engage the plate for preventing anyupward movement. When, for instance, it is desired to raise the lowersash, it is necessary to slide the control bars 26, moving the cam face29 for disengaging the pins 19. The lower sash 11 may then be raisedand'the pin released 'so that it will engage the notches in the plates15.

After the lower sash has been raised a short distance, then it can beraised further without any manipulation of the locking device, in viewof the fact that the sides of the notches are inclined. The engagementof the pins 19 with the notches in the plate 15 will prevent thelowering of the lower sash after once raised, unless the pins arewithdrawn.

In order to lower the upper sash, it is necessary to withdraw the pin 19which coacts with the plate 15'on the upper sash. The upper sash canthen be lowered as much spring plates 17 are as desired and the pinsagain permitted to engage'therewith for holding it against any furthermovement. The upper sash can be raised Without-any further manipulationof the pins 19.

It will be seen that when the sashes are in their entirely closedposition, they are held against any movement from the outside, due tothe engagement of thepins 1'9 therewith. The pins 19 alsorserve to holdthe Windows in any of their'raised positions as the case may be.

It Will be seen that I have provided a window locking structure whichis'to be used Without the ordinary weights and cords. My device isverysimple and can be easily installed upon window sashes.

From the construction of the parts just described,.it Willbe seen thatthe movement of the rod 26 in the direction indicated by the arrow 27will cause (the cam surface 29 to engage the spring plate 17 for movingit.

Some changes may be m'ade .in the construction and arrangement of thevarious parts of my invention without departing from the real. spiritand purpose of my inventi'on and 1t is my intention to cover by myclaim, any modified forms of structure or use ofmechanicalequivalents,Which may be reasonably included Within its scope.

I claim as my invention: In-combination With a Window having casingmembers, sash receiving frame members, and sashes slidably mountedtherein,

DAVID W. MoKINNI'S.

